120J
60Jg-1
120Jg-1
1500J
1500Jg-1
Correct answer is C
Heat energy = electrical energy
mL = I2Rt
5 x L = 2 x 2 x 5 x 30
L = 120Jg-1
Which of the following can be described as high tension transmission?
high resistance and low voltage
low current and high voltage
high current and low voltage
high voltage and zero current
high current and low resistance
Correct answer is B
No explanation has been provided for this answer.
Which of the following components is NOT contained in a dry cell? A
carbon rod
paste of magnesium dioxide
paste of ammonium chloride
zinc case
copper rod
Correct answer is E
No explanation has been provided for this answer.
0.75\(\Omega\)
1.5\(\Omega\)
0.5\(\Omega\)
1.0\(\Omega\)
0.6\(\Omega\)
Correct answer is A
E = 1.5v
rT = \(\frac{2 \times 2}{2 + 2}\)
= 1
e.m.f. = I(R + r)
1.5 = I(1 + 1)
I = 0.75\(\Omega\)
The resistance of a wire depends on
the length of the wire
the diameter of the wire
the temperature of the wire
the resistivity of the wire
all of the above
Correct answer is E
No explanation has been provided for this answer.